[PATCH net-next v2 5/7] net: ipa: disable interrupt and NAPI after channel stop

[Alex Elder]

Disable both the I/O completion interrupt and NAPI polling on a
channel *after* we successfully stop it rather than before.  This
ensures a completion occurring just before the channel is stopped
gets processed.

Enable NAPI polling and the interrupt *before* starting a channel
rather than after, to be symmetric.  A stopped channel won't
generate any completion interrupts anyway.

Enable NAPI before the interrupt and disable it afterward.

Signed-off-by: Alex Elder <el...@linaro.org>
---
v2: Update code for *both* NAPI and the completion interrupt.

 drivers/net/ipa/gsi.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
index 565c785e33a25..93e1d29b28385 100644
--- a/drivers/net/ipa/gsi.c
+++ b/drivers/net/ipa/gsi.c
@@ -860,15 +860,18 @@ static int __gsi_channel_start(struct gsi_channel 
*channel, bool start)
        struct gsi *gsi = channel->gsi;
        int ret;
 
+       napi_enable(&channel->napi);
+       gsi_irq_ieob_enable_one(gsi, channel->evt_ring_id);
+
        mutex_lock(&gsi->mutex);
 
        ret = start ? gsi_channel_start_command(channel) : 0;
 
        mutex_unlock(&gsi->mutex);
 
-       if (!ret) {
-               gsi_irq_ieob_enable_one(gsi, channel->evt_ring_id);
-               napi_enable(&channel->napi);
+       if (ret) {
+               gsi_irq_ieob_disable_one(gsi, channel->evt_ring_id);
+               napi_disable(&channel->napi);
        }
 
        return ret;
@@ -908,14 +911,11 @@ static int __gsi_channel_stop(struct gsi_channel 
*channel, bool stop)
        int ret;
 
        gsi_channel_trans_quiesce(channel);
-       napi_disable(&channel->napi);
-       gsi_irq_ieob_disable_one(gsi, channel->evt_ring_id);
 
        ret = stop ? gsi_channel_stop_retry(channel) : 0;
-
-       if (ret) {
-               gsi_irq_ieob_enable_one(gsi, channel->evt_ring_id);
-               napi_enable(&channel->napi);
+       if (!ret) {
+               gsi_irq_ieob_disable_one(gsi, channel->evt_ring_id);
+               napi_disable(&channel->napi);
        }
 
        return ret;
-- 
2.27.0